Assessing the reliability of thermography to infer internal body temperatures of lizards

作者：Barroso Frederico M; Carretero Miguel A; Silva Francisco; Sannolo Marco^*

来源：Journal of Thermal Biology, 2016, 62(Pt A): 90-96.

DOI：10.1016/j.jtherbio.2016.10.004

• Thermography
• Thermal imaging
• Infrared camera
• Lizard body temperature
• Regional heterothermy

For many years lizard thermal ecology studies have relied on the use of contact thermometry to obtain internal body temperature (T-b) of the animals. However, with progressing technology, an interest grew in using new, less invasive methods, such as InfraRed (IR) pyrometry and thermography, to infer T-b of reptiles. Nonetheless few studies have tested the reliability of these new tools. The present study tested the use of IR cameras as a noninvasive tool to infer T-b of lizards, using three differently body-sized lacertid species (Podarcis virescens, Lacerta schreiberi and Timon lepidus). Given the occurrence of regional heterothermy, we pairwise compared thermography readings of six body parts (snout, eye, head, dorsal, hind limb, tail base) to cloacal temperature (measured by a thermometer-associated thermocouple probe) commonly employed to measure T-b in field and lab studies. The results showed moderate to strong correlations (R-2=0.84-0.99) between all body parts and cloacal temperature. However, despite the readings on the tail base showed the strongest correlation in all three species, it was the eye where the absolute values and pattern of temperature change most consistently followed the cloacal measurements. Hence, we concluded that the eye would be the body location whose IR camera readings more closely approximate that of the animal's internal environment. Alternatively, other body parts can be used, provided that a careful calibration is carried out. We provide guidelines for future research using thermography to infer T-b of lizards.

• 出版日期2016-12